internal static void ValidateSortClause(DbExpression key, string collation)
{
ArgumentValidation.ValidateSortClause(key);
Check.NotEmpty(collation, nameof(collation));
if (!TypeSemantics.IsPrimitiveType(key.ResultType, PrimitiveTypeKind.String))
{
throw new ArgumentException(Strings.Cqt_Sort_NonStringCollationInvalid, nameof(collation));
}
}